will remain blank until you get a problem....
If you press the right hand push button on the dash you will get a check control...and if no errors all will be fine.
Open a door then drive forward, it will warn you then the door is open...or leave the lights on and turn ignition off...it will tell you your lights are on....or leave hand brake on and drive away, again will tell you that you have left the handbrake on.
If a bulb blows or a fuse goes, a message will display...
It won't give diagnostic information, or fault codes...it will indicate engine failsafe message or transmission failsafe message, or if the abs/hdc/eas/dsc goes south but won't tell you why....
The l322 will need lr specific diagnostics to read the various systems, although by law engine emission data nd faults are readable using a generic obdii scanner...but you won't get anything else on it!